The Dutch forest reserves network was officially created by the Ministry of Agriculture and Fisheries (now Agriculture, Nature and Food Quality) in 1987. A total of 60 forest reserves were designated for inclusion in the network between 1983 and 2000. In 2018, one reserve was excluded from the network. Firstly, this report presents general information on the distribution, area, ownership, physical geography, woodland types, Natura 2000 woodland habitat types, and the management history of the reserves. After this, the monitoring design is described, which includes measurements taken from trees, and regeneration, in circular sample plots throughout the reserves, and in a one hectare rectangular core area in each reserve. The structure of the Access-database of tree measurements is presented, and all tables documented. An overview is given of GIS files at the network- and reserve levels, and of GIS files derived from tree measurements in core areas. All these data are available from the Data Archiving and Networked Services (DANS) portal.